STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
STOCK-BASED COMPENSATION
Shares, Non-vested, Beginning balance	375	302
Shares, Granted	92	97
Shares, Vested	(33)	(105)
Shares, Forfeitures	(4)
Shares, Non-vested, Ending balance	430	294
Weighted Average Fair Value, Non-vested, Beginning balance	$ 10.05	$ 13.55
Weighted Average Fair Value, Granted	11.68	8.74
Weighted Average Fair Value, Vested	8.74	16.37
Weighted Average Fair Value, Forfeitures	11.68
Weighted Average Fair Value, Non-vested, Ending balance	$ 10.48	$ 10.95